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Kubernetes API could be used as an Authentication and Authorisation server. Kubernetes uses Service Accounts, Roles and RoleBindings. Service to service communication is allowed only if the token is legit for the two services involved. authentication and authorisation servers have to do is to:Authenticate the caller - The caller should have a valid and verifiable identity. Validate a token with a limited scope and the desired audience.

Authentication between microservices using Kubernetes identities